Studied the output features of photovoltaic(PV) array, set up a versatile PV array simulation model under Matlab environment, selected BOOST electric circuit, used maximum power point tracking control method and achieved maximum power point tracking and output voltage stability through S-function. This system was not only easy in its hardware design and control algorithm, but also the simulation result indicated that it could accurately reflect PV array output voltage and the current nonlinear features and could better track the maximum power point.